Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1979-04-02
1981-10-06
Lazarus, Richard B.
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 20, 241 29, B02C 2318, B02C 2336, B02C 2338
Patent
active
042930979
ABSTRACT:
A method is disclosed for processing a natural calcitic ore to yield a finely divided calcium carbonate particulate of very high brightness characteristics. The natural calcitic ore is initially coarse-milled to produce a product wherein no more than 5% by weight of the particulate is +325 mesh, and no more than 35% by weight of the particles are of less than 2 microns E.S.D. This coarse-milled product is then subjected as an aqueous slurry containing less than 40% and preferably less than 30% solids by weight, to a froth flotation, which separates with the froth the relatively coarse colorbodies liberated in the initial grinding. Preferable compositions for use in the froth flotation comprise 1-substituted-2-alkyl imidazolines or the salt derivatives thereof, with such compounds being utilized in admixture with a substantially non-polar aliphatic compound having from 10 to 20 carbon atoms in its longest straight chain. The purified underflow from the flotation step is dewatered to at least 60% solids by weight, and is wet-milled, as for example in a sand mill, to yield an output product wherein at least 80% by weight of the resultant particulate has an E.S.D. of less than 2 microns, the product being further characterized by a brightness of at least 95 on the G.E. scale.
REFERENCES:
patent: 3512722 (1970-05-01), Hall
patent: 3604634 (1971-09-01), Windle
patent: 3661610 (1972-05-01), Ferris
patent: 3674529 (1972-07-01), Toms
patent: 3980240 (1976-09-01), Nott
patent: 3990966 (1976-11-01), Stanley et al.
patent: 4165840 (1979-08-01), Lewis et al.
Lewis Herbert I.
McConnell Anthony D.
Price William M.
Anglo-American Clays Corporation
Lazarus Richard B.
LandOfFree
Method for brightening natural calcitic ores does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for brightening natural calcitic ores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for brightening natural calcitic ores will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1202841